Adwen’s AD 5-135 First Turbine to Obtain DNV GL Type Certificate


Adwen’s AD 5-135 turbine has obtained the first type certificate based on the “Guideline for the Certification of Offshore Wind Turbines, Edition 2012” issued by DNV GL. This new guideline updates the previous version from 2005 to fully comply with the GL’s  “Guideline for Onshore Wind Turbines, Edition 2010” and to cover IEC 61400, parts 1 and 3.

The new guideline contains a type certification process specifically developed for offshore wind turbines. It takes into account the important increase on the average size of turbines experienced from 2005 as well as the use of advanced, intelligent control systems to mitigate loads. Furthermore, the machinery and electrical design requirements are improved to be state-of-the-art.

The AD 5-135 is an evolution of the AD 5-116 that was first certified in March 2015 according to this guideline and has been updated to cope with the specific configuration required for Wikinger offshore wind farm, Iberdrola’s 350-MW project in the Baltic Sea. Among the new features are the 25-year operating lifetime and the grid loss system — a new system that allows energy production for self-consumption in case of temporary loss of grid connection.

“We are pleased to issue the first type certificate according to GL 2012 to Adwen for their AD 5-135 turbine,” said Mike Wöbbeking, head of the certification body at DNV GL-Energy. “As the development of modern offshore wind turbines is rapidly progressing, the guideline GL 2012 is taking all the latest safety and reliability requirements into account, including updated qualifications for load, mechanical engineering, and safety engineering.”

— Source: Adwen

For more information, go to